Barack Obama makes a statement on the climate agreement in the  White House after its adoption  at the World Climate Change Conference  (COP21). Photograph: Dennis Brack / EPA

World leaders have hailed the 11th-hour climate deal reached in Paris on Saturday, claiming it provides the “best chance we have” of saving the planet(...)

French foreign affairs Minister Laurent Fabius, president-designate of COP21,  on a giant screen as he speaks at the final session at the World Climate Change Conference 2015 (COP21) at Le Bourget, near Paris, France, December 12th, 2015. Photograph: Stephane Mahe/Reuters

As the Paris COP21 accord with its unprecedented collective global response to climate change was being ratified on Saturday evening, it was inevitabl(...)

Christiana Figueres, executive secretary of the United Nations Framework Convention on Climate Change, said the range of initiatives to combat climate change - from new technology, to conservations, to behaviour change - were brilliant but needed to be implemented swiftly. Photograph: Eric Piermont/AFP/Getty Images.

Many impressive responses to climate change have emerged in recent years but they need to be deployed immediately to avoid the rapid rise of world tem(...)

Exxon Mobil, one of the oil companies in which the city council holds shares. Photograph: Reuters

A campaign by climate activist Bill McKibben's 350.org has scored its biggest victory so far by persuading San Francisco's city council to call on (...)